Github user tgravescs commented on a diff in the pull request:
https://github.com/apache/spark/pull/3209#discussion_r20182510
--- Diff: docs/configuration.md ---
@@ -224,6 +224,7 @@ Apart from these, the following properties are also
available, and may be useful
(Experimental) Whether to give user-added jars precedence over Spark's
own jars when
loading classes in Executors. This feature can be used to mitigate
conflicts between
Spark's dependencies and user dependencies. It is currently an
experimental feature.
+ (On Yarn use spark.yarn.user.classpath.first)
--- End diff --
it was left undocumented on purpose (expert config) used as last resort
type thing.
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